the only year you would have to worry about the difference is in 1982 because they switched the composition halfway through the year

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This is not true. A number of 1983 cents have been discovered on copper planchets. And a few later dates than that as well.

One of the off metal copper cents was a little light (2.9 or so).
I am not saying this one is copper, but it could be copper on a thinly rolled planchet. I would get a much more exact scale to the hundredths.

Early internet references said it was the same, but searching later pops up the newer one. I figured the tolerances would be in % , so the same percentage when used with the 2.5g came out close to .10 g (.1025 as I recall), so I just accepted it. If anyone else does the math, thats Good. Jim